Same results here... Worth noting that the XP950 is very similar in design so if you can source that service manual that "should"(?) suffice.I searched for the tool and manual and found no free downloads, but it looks like they can be bought from 2manuals.com.
Most are leaked I suppose, but at least one code was found by dictionary attack, see this open resetting utility . If you are lucky it'll work on your model.I wonder how do sellers generate these reset codes for selling them?